1) the site is not legit
2) the key can absolutely be revoked

引用自 Satoru：

1) the site is not legit
2) the key can absolutely be revoked

2game is actually listed on isthereanydeal and the gamedeals subreddit also recognizes 2game as a legitimate key vendor.

Nonetheless, the key can be revoked, but a site being under maintenance is nothing to worry about. Only the developer/publisher of a game can revoke a product activation key.

Sure keys can be revoked for lots of reasons. It might be convenient for you if a mistake that benefited you was ignored. But there's no reason it has to be. Someone typo-ing 100% when maybe they meant 10% doesn't grant you any particular rights.

You have to think about it on a two way street. If the publisher made a mistake you might want them to eat it. Is that the world you want to live in? So the next time you make a mistake, say you meant to tip 10% but accidentally hit 100%, you're gonna be fine eating that mistake?

Lots of things are going to come down to if it's good for the goose, it's good for the gander.

The key will probably be revoked so don't get too comfortable with the game. The site made a mistake in giving away the game for free, took themselves down to avoid further damage and they'll probably be busy trying to rollback the damage. I very much doubt they will absorb the cost for every copy given away and as nobody paid anything, they will try and reverse it and that will mean in time the product is removed from your account.